无法为“UnsafeMutablePointer"类型调用初始化程序 [英] Cannot invoke initializer for type 'UnsafeMutablePointer'

问题描述

我正在尝试将 Reachability.swift 更新到 swift 3.0，但无法将 Reachability 实例传递给回调函数.

I'm trying to update Reachability.swift to swift 3.0 and I'm having trouble passing the Reachability instance to the call back function.

这是我的片段:* 请注意 self = Reachability class

Here is my snippet: * please note self = Reachability class

var context = SCNetworkReachabilityContext(version: 0, info: nil, retain: nil, release: nil, copyDescription: nil)

context.info = UnsafeMutablePointer(Unmanaged.passUnretained(self).toOpaque())

编译器抛出错误的地方说:

Where the compiler throws an error saying:

无法调用类型为UnsafeMutablePointer<_>"的初始化程序'(UnsafeMutableRawPointer)' 类型的参数列表

Cannot invoke initializer for type 'UnsafeMutablePointer<_>' with an argument list of type '(UnsafeMutableRawPointer)'

指针转换受限:使用'.assumingMemoryBound(to:)'或'.bindMemory(to:capacity:)' 将内存视为一种类型.

Pointer conversion restricted: use '.assumingMemoryBound(to:)' or '.bindMemory(to:capacity:)' to view memory as a type.

UnsafeMutablePointer<_>"的重载与这些部分存在匹配参数列表:(RawPointer)、(OpaquePointer)、(OpaquePointer?), (UnsafeMutablePointer),(UnsafeMutablePointer?)

Overloads for 'UnsafeMutablePointer<_>' exist with these partially matching parameter lists: (RawPointer), (OpaquePointer), (OpaquePointer?), (UnsafeMutablePointer), (UnsafeMutablePointer?)

据我所知，我需要将 open class Reachability: NSObject 类型的 self 转换为 UnsafeMutablPointer，但我不确定如何继续.

What I understand I need to convert self which is of type open class Reachability: NSObject to an UnsafeMutablPointer but Im not sure how to proceed.

推荐答案

检查 info 属性的类型来自 最新参考:

Check the type of info property from the latest reference:

声明

var info: UnsafeMutableRawPointer?

并且toOpaque()的类型变成了UnsafeMutableRawPointer.(我找不到最新的 Apple 文档，但您可以在 Xcode 的快速帮助"窗格中轻松查看.)

And the type of toOpaque() has become UnsafeMutableRawPointer. (I couldn't have found an up-to-date Apple document, but you can check it easily in the Quick Help pane of Xcode.)

您无需转换:

    context.info = Unmanaged.passUnretained(self).toOpaque()

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